1218371516 has 12 divisors (see below), whose sum is σ = 2133301632. Its totient is φ = 608856768.

The previous prime is 1218371501. The next prime is 1218371527. The reversal of 1218371516 is 6151738121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73820 + ... + 88803.

It is an arithmetic number, because the mean of its divisors is an integer number (177775136).

Almost surely, 2^1218371516 is an apocalyptic number.

It is an amenable number.

1218371516 is a deficient number, since it is larger than the sum of its proper divisors (914930116).

1218371516 is a wasteful number, since it uses less digits than its factorization.

1218371516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164500 (or 164498 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 1218371516 is about 34905.1789280617. The cubic root of 1218371516 is about 1068.0540857832.

The spelling of 1218371516 in words is "one billion, two hundred eighteen million, three hundred seventy-one thousand, five hundred sixteen".